Warning: Permanently added '10.128.0.195' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 73.469775][ T27] audit: type=1400 audit(1594411691.164:8): avc: denied { execmem } for pid=6816 comm="syz-executor767" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 73.637838][ T6869] ================================================================== [ 73.646218][ T6869] BUG: KASAN: use-after-free in tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 73.654841][ T6869] Read of size 2 at addr ffff8880a3850814 by task syz-executor767/6869 [ 73.663068][ T6869] [ 73.665422][ T6869] CPU: 1 PID: 6869 Comm: syz-executor767 Not tainted 5.8.0-rc4-syzkaller #0 [ 73.674089][ T6869] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.684144][ T6869] Call Trace: [ 73.687437][ T6869] dump_stack+0x18f/0x20d [ 73.691769][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 73.698009][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 73.704282][ T6869] print_address_description.constprop.0.cold+0xae/0x436 [ 73.711409][ T6869] ? ____sys_sendmsg+0x6e8/0x810 [ 73.716371][ T6869] ? ___sys_sendmsg+0xf3/0x170 [ 73.721135][ T6869] ? __sys_sendmsg+0xe5/0x1b0 [ 73.725803][ T6869] ? lockdep_hardirqs_off+0x66/0xa0 [ 73.731010][ T6869] ? vprintk_func+0x97/0x1a6 [ 73.735786][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 73.742011][ T6869] kasan_report.cold+0x1f/0x37 [ 73.746787][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 73.753035][ T6869] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 73.759545][ T6869] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 73.765365][ T6869] ? lock_is_held_type+0xb0/0xe0 [ 73.770304][ T6869] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 73.780014][ T6869] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 73.785986][ T6869] ? __kmalloc_node_track_caller+0x38/0x60 [ 73.791780][ T6869] ? kasan_unpoison_shadow+0x33/0x40 [ 73.797070][ T6869] ? __phys_addr+0x9a/0x110 [ 73.801578][ T6869] ? memset+0x20/0x40 [ 73.805565][ T6869] genl_lock_dumpit+0x7f/0xb0 [ 73.810259][ T6869] netlink_dump+0x4cd/0xf60 [ 73.814752][ T6869] ? netlink_insert+0x1670/0x1670 [ 73.819766][ T6869] ? __mutex_unlock_slowpath+0xe2/0x610 [ 73.825299][ T6869] ? genl_start+0x45a/0x6e0 [ 73.829791][ T6869] __netlink_dump_start+0x643/0x900 [ 73.834991][ T6869] ? genl_rcv_msg+0x9e0/0x9e0 [ 73.839831][ T6869] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 73.845980][ T6869] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 73.851711][ T6869] ? genl_rcv+0x40/0x40 [ 73.855855][ T6869] ? mutex_lock_io_nested+0xf60/0xf60 [ 73.861216][ T6869] ? mark_lock+0xbc/0x1710 [ 73.865639][ T6869] ? genl_rcv_msg+0x9e0/0x9e0 [ 73.876222][ T6869] ? genl_unlock+0x20/0x20 [ 73.880638][ T6869] ? genl_parallel_done+0x170/0x170 [ 73.885830][ T6869] ? __radix_tree_lookup+0x1f3/0x290 [ 73.891107][ T6869] genl_rcv_msg+0x797/0x9e0 [ 73.895609][ T6869] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 73.902534][ T6869] ? lock_acquire+0x1f1/0xad0 [ 73.907204][ T6869] ? genl_rcv+0x15/0x40 [ 73.911398][ T6869] ? lock_release+0x8d0/0x8d0 [ 73.916064][ T6869] netlink_rcv_skb+0x15a/0x430 [ 73.920823][ T6869] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 73.927767][ T6869] ? netlink_ack+0xa10/0xa10 [ 73.932361][ T6869] genl_rcv+0x24/0x40 [ 73.936363][ T6869] netlink_unicast+0x533/0x7d0 [ 73.941128][ T6869] ? netlink_attachskb+0x810/0x810 [ 73.946224][ T6869] ? _copy_from_iter_full+0x247/0x890 [ 73.951598][ T6869] netlink_sendmsg+0x856/0xd90 [ 73.956370][ T6869] ? netlink_unicast+0x7d0/0x7d0 [ 73.961303][ T6869] ? netlink_unicast+0x7d0/0x7d0 [ 73.966256][ T6869] sock_sendmsg+0xcf/0x120 [ 73.970683][ T6869] ____sys_sendmsg+0x6e8/0x810 [ 73.975439][ T6869] ? kernel_sendmsg+0x50/0x50 [ 73.980102][ T6869] ? do_recvmmsg+0x6d0/0x6d0 [ 73.984716][ T6869] ? find_held_lock+0x2d/0x110 [ 73.989529][ T6869] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 73.995537][ T6869] ? lock_downgrade+0x820/0x820 [ 74.000379][ T6869] ___sys_sendmsg+0xf3/0x170 [ 74.005054][ T6869] ? sendmsg_copy_msghdr+0x160/0x160 [ 74.010348][ T6869] ? debug_object_active_state+0x260/0x350 [ 74.016159][ T6869] ? lock_downgrade+0x820/0x820 [ 74.021004][ T6869] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 74.026797][ T6869] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 74.032784][ T6869] ? trace_hardirqs_on+0x5f/0x220 [ 74.037825][ T6869] ? lockdep_hardirqs_on+0x6a/0xe0 [ 74.042922][ T6869] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 74.048740][ T6869] ? debug_object_active_state+0x260/0x350 [ 74.054558][ T6869] ? check_preemption_disabled+0x50/0x130 [ 74.060385][ T6869] ? __fget_light+0x215/0x280 [ 74.065253][ T6869] __sys_sendmsg+0xe5/0x1b0 [ 74.069756][ T6869] ? __sys_sendmsg_sock+0xb0/0xb0 [ 74.074812][ T6869] ? lock_is_held_type+0xb0/0xe0 [ 74.079755][ T6869] ? do_syscall_64+0x1c/0xe0 [ 74.084385][ T6869] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 74.090359][ T6869] do_syscall_64+0x60/0xe0 [ 74.094806][ T6869] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.100697][ T6869] RIP: 0033:0x4452b9 [ 74.104692][ T6869] Code: Bad RIP value. [ 74.108774][ T6869] RSP: 002b:00007ffd7a70e518 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 74.117193][ T6869] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452b9 [ 74.125167][ T6869] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 74.133144][ T6869] RBP: 0000000000011f82 R08: 0000000000000000 R09: 00000000004002e0 [ 74.141105][ T6869] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004023d0 [ 74.149686][ T6869] R13: 0000000000402460 R14: 0000000000000000 R15: 0000000000000000 [ 74.157760][ T6869] [ 74.160078][ T6869] Allocated by task 6871: [ 74.164394][ T6869] save_stack+0x1b/0x40 [ 74.168625][ T6869] __kasan_kmalloc.constprop.0+0xc2/0xd0 [ 74.174248][ T6869] __alloc_skb+0xae/0x550 [ 74.178577][ T6869] netlink_sendmsg+0x94f/0xd90 [ 74.183348][ T6869] sock_sendmsg+0xcf/0x120 [ 74.187770][ T6869] ____sys_sendmsg+0x6e8/0x810 [ 74.192635][ T6869] ___sys_sendmsg+0xf3/0x170 [ 74.197217][ T6869] __sys_sendmsg+0xe5/0x1b0 [ 74.201719][ T6869] do_syscall_64+0x60/0xe0 [ 74.206150][ T6869] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.212021][ T6869] [ 74.214338][ T6869] Freed by task 6871: [ 74.218317][ T6869] save_stack+0x1b/0x40 [ 74.222473][ T6869] __kasan_slab_free+0xf5/0x140 [ 74.227317][ T6869] kfree+0x103/0x2c0 [ 74.231208][ T6869] skb_release_data+0x6d9/0x910 [ 74.236161][ T6869] consume_skb+0xc2/0x160 [ 74.240495][ T6869] netlink_unicast+0x53b/0x7d0 [ 74.245418][ T6869] netlink_sendmsg+0x856/0xd90 [ 74.250168][ T6869] sock_sendmsg+0xcf/0x120 [ 74.254585][ T6869] ____sys_sendmsg+0x6e8/0x810 [ 74.259354][ T6869] ___sys_sendmsg+0xf3/0x170 [ 74.263950][ T6869] __sys_sendmsg+0xe5/0x1b0 [ 74.268467][ T6869] do_syscall_64+0x60/0xe0 [ 74.272922][ T6869] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.278805][ T6869] [ 74.281159][ T6869] The buggy address belongs to the object at ffff8880a3850800 [ 74.281159][ T6869] which belongs to the cache kmalloc-512 of size 512 [ 74.295197][ T6869] The buggy address is located 20 bytes inside of [ 74.295197][ T6869] 512-byte region [ffff8880a3850800, ffff8880a3850a00) [ 74.308557][ T6869] The buggy address belongs to the page: [ 74.314179][ T6869] page:ffffea00028e1400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 74.323271][ T6869] flags: 0xfffe0000000200(slab) [ 74.328112][ T6869] raw: 00fffe0000000200 ffffea0002899908 ffffea00023c6388 ffff8880aa000a80 [ 74.336702][ T6869] raw: 0000000000000000 ffff8880a3850000 0000000100000004 0000000000000000 [ 74.345269][ T6869] page dumped because: kasan: bad access detected [ 74.351663][ T6869] [ 74.353973][ T6869] Memory state around the buggy address: [ 74.359590][ T6869] ffff8880a3850700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 74.367639][ T6869] ffff8880a3850780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 74.375715][ T6869] >ffff8880a3850800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 74.383775][ T6869] ^ [ 74.388355][ T6869] ffff8880a3850880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 74.397042][ T6869] ffff8880a3850900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 74.405098][ T6869] ================================================================== [ 74.413149][ T6869] Disabling lock debugging due to kernel taint [ 74.428920][ T6869] Kernel panic - not syncing: panic_on_warn set ... [ 74.436700][ T6869] CPU: 1 PID: 6869 Comm: syz-executor767 Tainted: G B 5.8.0-rc4-syzkaller #0 [ 74.446759][ T6869] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.456815][ T6869] Call Trace: [ 74.460113][ T6869] dump_stack+0x18f/0x20d [ 74.464459][ T6869] ? tipc_nl_node_dump_monitor_peer+0x410/0x590 [ 74.470707][ T6869] panic+0x2e3/0x75c [ 74.474611][ T6869] ? __warn_printk+0xf3/0xf3 [ 74.479239][ T6869] ? preempt_schedule_common+0x59/0xc0 [ 74.484704][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 74.490936][ T6869] ? preempt_schedule_thunk+0x16/0x18 [ 74.496299][ T6869] ? trace_hardirqs_on+0x55/0x220 [ 74.501333][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 74.507562][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 74.513785][ T6869] end_report+0x4d/0x53 [ 74.518101][ T6869] kasan_report.cold+0xd/0x37 [ 74.522779][ T6869] ? tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 74.529108][ T6869] tipc_nl_node_dump_monitor_peer+0x4da/0x590 [ 74.535171][ T6869] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 74.541021][ T6869] ? lock_is_held_type+0xb0/0xe0 [ 74.545963][ T6869] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 74.551511][ T6869] ? kmem_cache_alloc_node_trace+0x3b0/0x400 [ 74.557500][ T6869] ? __kmalloc_node_track_caller+0x38/0x60 [ 74.563297][ T6869] ? kasan_unpoison_shadow+0x33/0x40 [ 74.568569][ T6869] ? __phys_addr+0x9a/0x110 [ 74.573089][ T6869] ? memset+0x20/0x40 [ 74.577067][ T6869] genl_lock_dumpit+0x7f/0xb0 [ 74.581721][ T6869] netlink_dump+0x4cd/0xf60 [ 74.586205][ T6869] ? netlink_insert+0x1670/0x1670 [ 74.591229][ T6869] ? __mutex_unlock_slowpath+0xe2/0x610 [ 74.596753][ T6869] ? genl_start+0x45a/0x6e0 [ 74.601231][ T6869] __netlink_dump_start+0x643/0x900 [ 74.606419][ T6869] ? genl_rcv_msg+0x9e0/0x9e0 [ 74.611098][ T6869] ? tipc_nl_node_dump_monitor+0x300/0x300 [ 74.616929][ T6869] genl_family_rcv_msg_dumpit+0x2ac/0x310 [ 74.622647][ T6869] ? genl_rcv+0x40/0x40 [ 74.626825][ T6869] ? mutex_lock_io_nested+0xf60/0xf60 [ 74.632187][ T6869] ? mark_lock+0xbc/0x1710 [ 74.636635][ T6869] ? genl_rcv_msg+0x9e0/0x9e0 [ 74.641337][ T6869] ? genl_unlock+0x20/0x20 [ 74.645756][ T6869] ? genl_parallel_done+0x170/0x170 [ 74.650958][ T6869] ? __radix_tree_lookup+0x1f3/0x290 [ 74.656228][ T6869] genl_rcv_msg+0x797/0x9e0 [ 74.660816][ T6869] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 74.667751][ T6869] ? lock_acquire+0x1f1/0xad0 [ 74.672446][ T6869] ? genl_rcv+0x15/0x40 [ 74.676701][ T6869] ? lock_release+0x8d0/0x8d0 [ 74.681368][ T6869] netlink_rcv_skb+0x15a/0x430 [ 74.686137][ T6869] ? genl_family_rcv_msg_attrs_parse.isra.0+0x310/0x310 [ 74.693056][ T6869] ? netlink_ack+0xa10/0xa10 [ 74.697652][ T6869] genl_rcv+0x24/0x40 [ 74.701631][ T6869] netlink_unicast+0x533/0x7d0 [ 74.706398][ T6869] ? netlink_attachskb+0x810/0x810 [ 74.711517][ T6869] ? _copy_from_iter_full+0x247/0x890 [ 74.716884][ T6869] netlink_sendmsg+0x856/0xd90 [ 74.721638][ T6869] ? netlink_unicast+0x7d0/0x7d0 [ 74.727278][ T6869] ? netlink_unicast+0x7d0/0x7d0 [ 74.732200][ T6869] sock_sendmsg+0xcf/0x120 [ 74.736614][ T6869] ____sys_sendmsg+0x6e8/0x810 [ 74.741380][ T6869] ? kernel_sendmsg+0x50/0x50 [ 74.746561][ T6869] ? do_recvmmsg+0x6d0/0x6d0 [ 74.751142][ T6869] ? find_held_lock+0x2d/0x110 [ 74.755893][ T6869] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 74.761970][ T6869] ? lock_downgrade+0x820/0x820 [ 74.766820][ T6869] ___sys_sendmsg+0xf3/0x170 [ 74.771486][ T6869] ? sendmsg_copy_msghdr+0x160/0x160 [ 74.776760][ T6869] ? debug_object_active_state+0x260/0x350 [ 74.782557][ T6869] ? lock_downgrade+0x820/0x820 [ 74.787405][ T6869] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 74.793199][ T6869] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 74.799164][ T6869] ? trace_hardirqs_on+0x5f/0x220 [ 74.804185][ T6869] ? lockdep_hardirqs_on+0x6a/0xe0 [ 74.809309][ T6869] ? _raw_spin_unlock_irqrestore+0x9b/0xe0 [ 74.815112][ T6869] ? debug_object_active_state+0x260/0x350 [ 74.820922][ T6869] ? check_preemption_disabled+0x50/0x130 [ 74.826642][ T6869] ? __fget_light+0x215/0x280 [ 74.831329][ T6869] __sys_sendmsg+0xe5/0x1b0 [ 74.835818][ T6869] ? __sys_sendmsg_sock+0xb0/0xb0 [ 74.840835][ T6869] ? lock_is_held_type+0xb0/0xe0 [ 74.845776][ T6869] ? do_syscall_64+0x1c/0xe0 [ 74.850352][ T6869] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 74.856317][ T6869] do_syscall_64+0x60/0xe0 [ 74.860715][ T6869] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 74.866616][ T6869] RIP: 0033:0x4452b9 [ 74.870536][ T6869] Code: Bad RIP value. [ 74.874590][ T6869] RSP: 002b:00007ffd7a70e518 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 74.882978][ T6869] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004452b9 [ 74.891297][ T6869] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 [ 74.899248][ T6869] RBP: 0000000000011f82 R08: 0000000000000000 R09: 00000000004002e0 [ 74.907238][ T6869] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004023d0 [ 74.915186][ T6869] R13: 0000000000402460 R14: 0000000000000000 R15: 0000000000000000 [ 74.924077][ T6869] Kernel Offset: disabled [ 74.928403][ T6869] Rebooting in 86400 seconds..